Method of making metal rings.



T. E. MURRAY.

METHOD OF MAKING METAL RINGS.

APPLICATION FILED Nov 1. 1917.

1,267,251. Patented'May 21,1918.

UNITED STATES PATENT OFFICE.

THOMAS E. MURRAY, 0]? NEW YORK, N. Y.

METHOD OF MAKING" METAL RINGS.

Specification of Letters Patent. Patented May 21, 1918.

Application filed November 1, 1917. Serial No. 199,776.

To all whom it may concern:

Be it known that I, THOMAS E. MURRAY, acitizen of the United States, residing at New York, in the county of New York and State of New York, have invented a certain new and useful Improvement in Methods of Making Metal Rings, of which the following rings, for example, may be used within or without cylindrical shells or casings of sheet metal to serve as supports on strengthening ribs. The usual mode of making a ring of this kind is to draw a fiat plate into a cup hating its cylindrical wall of suitable width for the desired ring. The bottom of the cup is then cut olf, leaving the wall in annular form. As repeated drawing operations may be necessary, and allowance must be made for consequent diminutions in thickness of the plate, and the removed bottom may be of no immediate utility, this proceeding is expensive, difiicult and requires much care and calculation to insure reasonable accuracy. Y

I select two plates or bars of suitable thickness and width. On each plate I lay oil a middle portion equal in length to that of a semi-circle of the desired ring, and also two end portions respectively at opposite ends of said middle portions. If beyond these end portions, other portions of the bars or plates still remain, such other portions are to e removed. I then bend the middle portion only of each ring in a true semi-circle, so that from the extremities of the two semicircular ring sections the end portions will extend straight and parallel. I then seat the plates, bent as described, in recesses in suitable electrodes, so that said end portions is ill protrude and face one another. Then by moving one or both electrodes, I press the said ends strongly together, and establish a welding electrical current to said elec trodes. This renders the protruding end portions of the ring sections plastic, so that the pressure continuing, the metal of said end portions is extruded from the joint until the extremities of the truly semi-circular ring sections come together, thus completing the ring. The extruded metal at the joint is afterward ground ofi, or otherwise taken away, leaving the surfaces smooth.

In the drawings the size of the straight end portions with respect to themiddle or semi-circular portions of the ring sections is purposely exaggerated for the sake of clearness.

In the accompanying drawings- Figure 1 is a plan view of the two plates from which the ring sections are made. Fig. 2 is a plan view, showing the sections after bending seated in separated electrodes. Fig.

3 shows the sections welded together and still seated in said electrodes. section on the line :20, m of Fig. 2. an edge view of the completed ring.

Similar letters and numbers of reference indicate like parts.

A and B, Fig. 1, are two flat metal plates or bars alike in dimensions, from which the ring is to be made. On plate A, I lay 011 a middle portion 1, 2 equal in length to the semi-circumference of the desired ring, and on the plate B, a like middle portion 3, 4. Beyond each end of middle portion 1, 2, I lay off an end portion 2, 5 and 1, 6, and beyond each end of middle portion 3, 4, I lay off similar end portions 3, 7 and 4, 8.

I bend the middle portion 1, 2 of the plate A to form a semi-circular ring section, and I bend the middle portion 3, 4 of plate B to form a like semi-circular ring section. The

end portions 1, 6; 2,5; 3, 7 and 4, 8 will then be parallel and extend beyond the ends of Said semi-circular sections.

I place the semi-circular sections in semicircular recesses in electrodes G, D, as shown in Fig. 2, so that said end portions will pro trude beyond the opposing faces of said electrodes. By moving either electrode, or both of them, I press said end portions together. The welding current is also established.

Said end portions are thus fused, and as the pressure continues, are melted and extruded at the joints until the extremities of semi-circular section 1, 2 meet the extremities of semi-circular section 3, 4, when the rin becomes completed.

he length of end portions 2, 5; 1, 6; 3, 7 and 4, 8 will depend uponthe amount of metal which may be determined as the minimum necessary to insure close union of the semi-circular sections at the joints. Whatever fused metal is extruded is to be cut or ground oil in any suitable way.

by just It is to be noted that said end portions are formed on both semi-circular sections, and not solely on one of them. If, for exam le, in Fig. 1 the end portions 1,16 \and 2, 5 were retained, and the end portions 3, v7 and 4c, 8on-the opposing semi-circular section were omitted, it would not be practicable to produce a truly circular ring, for the reason that when sa d end portions 1, 6 and 2, 15 met the extremities of semi-circular section 3, 4:, the fusing Ofthemtal would take place'partly in said end portions and partly in said semi-circular section, andthe latter would then cease to be a. semi-circle the contact faces of said electrodes affter'the ring'is welded, a layer 9 of insulating inations of said sections the amount of metal c'onsumetl. Hence the ends of saidsections Would not terial may be secured upon theface of one of said electrodes.

twoiflat .plates middle portions 1,-2-and .3,

4;, each equal in length to a semi-circumferenee-cwf-saidrin'gand, at the extremities of said laid oif middle portions, end portions 1, 6; 2, 5' 3, 7 and 4c, '8; "second,'bending said middle portions to form'semi-circular ring sections 'third, pressing said *end portogether and 'electri cally heating the same until the metal of said end portions is renderedp'lastic and said semi-circular ring sections some together and are united.

In testimony whereof 'I have afiixed'my signature in presence-of two witnesses.

THOMAS E. iMURRAY.

Witnesses: v

GERTRUDE '1. Poems, MAY T. MCGARRY.

ex-- trude'd atthe joints-and the 'extremities'of 

